Race-gas

D-50394 said
Build your car to run on pump gas and you do not have to deal with all the extra trouble or cost. Then if you want to run a little faster you can run E-85. I just run pump gas. It is not worth the extra trouble or cost to me any more. I used to have a car that had to use race gas.

That's all good if you haven't built the engine already. Most guys are going to avoid taking an engine out to rebuild it just to run pump gas. Or having to modify the fuel system to run E85 isn't appealing and the availability isn't the greatest . My motor was just under 14:1 when I bought it and wasn't going to tear it down unless I absolutely had to. I was planning on running E85 because it is available here and I had to redo my fuel system anyhow. But things went south and I had to rebuild it. I was running Sunoco 112, made a hard run on it one day and my plugs showed that I was detonating for some reason. Whether it was the fuel, too hot of plug, carb issue, I'm not sure. It shouldn't have been doing that but it smoked after that day and I knew something went wrong. Turned out my rings ended up getting trashed. So in the rebuild, I wanted the option of pump gas so I ended up ordering a custom set of pistons with a -25cc reverse dome just to get it down to 11:1 where I could run pump gas if I wanted to. But most guys don't have the option of a motor rebuild so this stuff just may be the ticket.